Xishan Coal Electricity Group Co.

Taiyuan, China

Xishan Coal Electricity Group Co.

Taiyuan, China
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Xi-Liang S.,LIAONING Technical University | Jian-Liang W.,Xishan Coal Electricity Group Co. | Wen-Xin X.,LIAONING Technical University | Jun M.,LIAONING Technical University | Miao X.,Xishan Coal Electricity Group Co.
Advanced Materials Research | Year: 2013

Through design and research of four crawler dual-arm walking mechanism of rescue vehicle, this paper has analyzed the obstacle navigation theory, ensure the center of mass in every working state and draw a clear relationship between working condition and design parameters of four crawler dual-arm walking mechanism's crawler. By doing research on kinetics of forward and reverse climbing over obstacle of crawler walking mechanism, designing the four crawler dual-arm walking mechanism, and then fixing parameters of the arms, the problem of climbing over obstacles underground has been solved well. Finally, the three - dimensional diagram of its elevation and swing angle relationship has been simulated using MATLAB software. © (2013) Trans Tech Publications, Switzerland.


Long J.-H.,Taiyuan University of Technology | Long J.-H.,Chang'an University | Guo W.-B.,Xishan Coal Electricity Group Co. | Li P.,Chang'an University | Li T.-L.,Chang'an University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

Soils at different depths are sampled from 11 recent or apt-to-be landslides located in Jingyang County along the Jinghe River. Considering their geological environment and irrigation conditions, triaxial creep tests and direct shear creep tests on these undisturbed soil samples separately under different stress levels and moisture contents are performed to study their creep property. The findings are as follows: the creep deformation consists of 3 stages, namely, constant speed creep, acceleration creep and creep rupture, and the period from the acceleration creep to the creep rupture is significantly short; the rupture of the soil in sliding zone is characterized by plastic destruction; the corresponding strain capacity ε of the creep rupture is basically below 10%, and with the increase of the moisture content, ε of the creep rupture accordingly decreases; the results of destruction strain capacity by the direct shear creep tests under different moisture content conditions are all below 4%; and the stress-strain isochronic curves under time (t>0 min) are nearly a bunch of series of curves and exhibit a "normalization" phenomenon, demonstrating that the soil in this sliding zone has consistent creep characteristics. The intrinsic relationship between the creep property and the prediction model of slope failure is also discussed. Experimental studies and theoretical discussions are given for forecasting loess landslides.


Liu Z.-G.,China University of Mining and Technology | Bian Z.-F.,China University of Mining and Technology | Lv F.-X.,Xishan Coal Electricity Group Co Ltd | Dong B.-Q.,Xishan Coal Electricity Group Co Ltd
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2013

The high resolution TerraSAR-X SAR data was used to monitor ground subsidence caused by underground coal mining activities with time-series DInSAR method. Analysis was made based on the detailed stoping records of the related working face. With the identified bounds of subsidence, some angular parameters, such as advanced influence angle, angle of subsidence and moving distance were derived. These parameters could be used to depict the evolution of ground subsidence caused by repeated coal excavation, which is quite different compared with subsidence caused by the first mining. In the end, terrestrial GPS surveying results, which were carried out at the same date when SAR image was acquired, were used to evaluate the DInSAR technology. The results confirm the reliability and validity of X-band SAR data in terms of subsidence boundary extraction and related angular parameters derivation, thus promoting the quantitative application of DInSAR technology.


Jing-Jing W.,LIAONING Technical University | Xu-Hong W.,Xishan Coal Electricity Group Co. | Wen-Xin X.,LIAONING Technical University | Miao X.,LIAONING Technical University | Jun M.,Xishan Coal Electricity Group Co.
Advanced Materials Research | Year: 2013

Regarding the liquid-air hammer rod as the research object, the equivalent stress contour of the hammer rod has been obtained through transient dynamics simulation analysis of the hammer rod impact process by using finite element method. This paper has studied node rate response in different positions of the hammer rod to provide evidence for structure design of this kind of impact members. © (2013) Trans Tech Publications, Switzerland.


Bui M.,China University of Mining and Technology | Bui M.,Hanoi University of Mining and Geology | Lu Y.,China University of Mining and Technology | Guo W.,China University of Mining and Technology | And 2 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2014

In order to ensure the stability of the thick coal seam with parting in gob-side entry in longwall top coal caving, and to increase the safety and effectiveness in mining, the numerical model has been employed to analyse the stress distribution of gob-side entry, plastic strain area distribution and movement of rocks under the different conditions of dirt bands. Result of research shows that the existence of band layers has destroyed the continuity of the surrounding rock, which causes the roads becoming unstable; while in the thick layers, surrounding rocks are relatively stable. When hardness of the layers and that of coal seam are the same, and these bands lay on the top of road, the rocks surrounding the roads are also relatively stable. And on this basis, an appropriate technique of surrounding rock control is proposed, in which a combination of rock bolting-wire mesh and steel rectangular shape support are chosen and the suitable parameters are identified. Engineering practice has proved the rationality of the proposed technique, ensuring the safety and effectiveness in long wall extraction. ©, 2014, China University of Mining and Technology. All right reserved.


Liu Z.,China University of Mining and Technology | Liu Z.,Jiangsu Key Laboratory of Resources and Environmental Information Engineering | Bian Z.,China University of Mining and Technology | Bian Z.,Jiangsu Key Laboratory of Resources and Environmental Information Engineering | And 2 more authors.
International Journal of Mining Science and Technology | Year: 2013

DInSAR technology was used to monitor subsidence caused by underground coal mining activities in mountainous area, with multi source SAR data, including 8 EnviSAT C-band and 4 ALOS L-band, and 4 programmed TerraSAR-X dataset. The results revealed that 2-pass DInSAR technique sometimes failed to retrieve the mining-caused subsidence due to spatial and/or temporal de-correlation. We also noticed that there existed residual topographic phase after the compensation with SRTM DEM, which could almost overwhelm the subsidence information when the perpendicular baseline was relatively large. Based on the mining materials, analysis was made on the shape of subsidence area. For the well geo-coded results from TerraSAR-X, confirmed by GPS surveying results of corner reflectors, we tried to extract the advance distance of influence besides the subsidence area. Due to the big deformation gradient over stopingfaces, the X-band SAR data could not capture the maximum value subsidence revealed by GPS survey in our preliminary results, the same as C-band EnviSAT data. This will turn to be our research subject in the next few months. © 2013 Published by Elsevier B.V. on behalf of China University of Mining & Technology.


Dong R.B.,LIAONING Technical University | Li Z.S.,XiShan Coal Electricity Group Co. | Xu W.X.,LIAONING Technical University | Xie M.,LIAONING Technical University
Advanced Materials Research | Year: 2013

For the purpose of optimizing the dynamic characteristics of large forging equipment multilevel cartridge valves, according to the structure and principle of the Rexroth's LC series cartridge elements, using AMESim simulation software, the influence of forging equipment cartridge valves switching characteristics be discussed respectively from the damping R2, the damping R1, the load pressure. The results show that the damping R1, the damping R2, the system pressure, and the work load to cartridge valves switching characteristics have certain effect[2]. The research gives a method for analyzing and adjusting the cartridge valve response characteristics. © (2013) Trans Tech Publications, Switzerland.


Meng J.,China University of Mining and Technology | Meng J.,Xishan Coal Electricity Group Co. | Jiang Z.J.,China University of Mining and Technology | Zhang M.M.,China University of Mining and Technology | Qin Y.P.,China University of Mining and Technology
Advanced Materials Research | Year: 2013

Based on fluid mechanics, the theory of gas-solid flow and jet theory etc. Dust migration regularity in fully mechanized workface was studied and simulated under far-pressing-near-suction ventilation with FLUENT Simulation technology. When the ratio of blowing to suction(μ) is larger than 1, the range of high dust concentration reduces and the maximum dust concentration decreases. The sketch of flow field of the different μ, the short of traditional far-pressing-near-suction ventilation and the superiority in practical of dust removal mode with the forced ventilation shunt were summarized and analyzed. The dust migration regularity in different shunt parameters (K) in this mode was simulated. Increasing shunted air quantities (Q) is beneficial to the control of dust diffusion in the roadway. But dust concentration near pressure air side will increase if the value of the shunted air quantities is over a critical value. © (2013) Trans Tech Publications, Switzerland.


Xie M.,LIAONING Technical University | Meng J.,Xishan Coal Electricity Group Co. | Xu W.-X.,LIAONING Technical University | Dong R.-B.,LIAONING Technical University | Wang J.-L.,Xishan Coal Electricity Group Co.
Advanced Materials Research | Year: 2013

In order to optimize the dynamic characteristic of hydraulic system of large forging equipment. It based on the model of one company of a certain aero-engine hydraulic system of hydraulic hammer forging, analysis the composition and working principle of hydraulic systems. Using simulation software AMESim, simulate the model of hydraulic systems and by changing the system pressure, flow and effect of the hammer-head stroke to explore this kind of switching characteristics of forging equipment's hydraulic system. The result shows that this kind of simulation models can reflect the working status of hydraulic hammer well, and provide a technical reference for analysis and tuning equipment that with similar to forging equipment. © (2013) Trans Tech Publications, Switzerland.


Nenghu Z.,China University of Mining and Technology | Nenghu Z.,Xishan Coal Electricity Group Co. | Qi W.,China University of Mining and Technology | Yong Y.,China University of Mining and Technology | Qingsheng B.,China University of Mining and Technology
Mining Science and Technology | Year: 2011

Gateways at faces of great mining heights are mostly driven along the roof of coal seams. For gateway height restrictions, a 1-3 m floor coal is retained, leaving a triangular floor coal at the face ends, causing a loss of coal. In order to improve coal recovery rates and to ensure efficiency of equipment at coal mining faces, we investigated suitable retention methods and recovery technology of floor coal at face ends. The upper floor coal can directly be recovered by a shearer with floor dinting. The lower floor coal is recovered by shearer with floor dinting after advanced floor dinting and retaining a step for protecting coal sides in a haulage gateway. Field practice shows that this method can improve the coal recovery rates at fully mechanized working faces with great mining heights. © 2011, China University of Mining & Technology. All rights reserved.

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